/********************************************************
* File: dupe.c
* Created at Sun Jan 28 22:10:29 MSK 2001 by raorn // raorn@binec.ru
* Dupes handling
* $Id: dupe.c,v 1.10 2002/08/12 18:19:15 raorn Exp $
*******************************************************/
#include "crashecho.h"
static const unsigned long crc32tab[] = { /* CRC polynomial 0xedb88320 */
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
#define crc32add(crc,c) (crc32tab[(unsigned char)crc ^ (unsigned char)c] ^ ((unsigned long)crc >> 8))
#define DUPE_IDENTIFIER "CDU2"
#define GETULONG(ptr) ((((uchar*)(ptr))[0] & 0xFF)+((((uchar*)(ptr))[1] & 0xFF) << 8)+((((uchar*)(ptr))[2] & 0xFF) << 16)+((((uchar*)(ptr))[3] & 0xFF) << 24))
#define PUTULONG(ptr, num) do{ ((uchar*)(ptr))[0] = ((uchar)(num)) & 0xFF; ((uchar*)(ptr))[1] = ((uchar)((num) >> 8)) & 0xFF; ((uchar*)(ptr))[2] = ((uchar)((num) >> 16)) & 0xFF; ((uchar*)(ptr))[3] = ((uchar)((num) >> 24)) & 0xFF; }while(0)
ulong dupe_firstentry;
ulong dupe_lastentry;
ulong dupe_nextpos;
ulong dupe_emptyend;
ulong dupe_lastinbuf;
bool dupechanged;
uchar *dupebuf;
bool MakeDupeInfo(uchar **dupeinfo, ulong *dupelen, struct MemMessage *mm)
{
ulong crc = 0xFFFFFFFF, c;
struct TextChunk *chunk;
/* Calculate dupeinfo length */
*dupelen = sizeof(ulong) + 1; /* CRC32 + NUL */
if (mm->MSGID[0] == 0) {
*dupelen += strlen(mm->DateTime) + 1; /* DateTime + NUL */
} else {
*dupelen += strlen(mm->MSGID) + 1; /* MSGID + NUL */
}
*dupelen += strlen(mm->Area); /* Area */
*dupelen = (*dupelen + 3) & 0xFFFFFFFCUL; /* Align at 4 bytes */
if ((*dupeinfo = calloc(*dupelen, sizeof(uchar))) == NULL) {
LogWrite(1, SYSTEMERR, "Can't allocate %ld bytes", *dupelen);
return FALSE;
}
for (c = 0; c < strlen(mm->To); c++)
crc = crc32add(crc, (mm->To[c]));
for (c = 0; c < strlen(mm->From); c++)
crc = crc32add(crc, (mm->From[c]));
for (c = 0; c < strlen(mm->Subject); c++)
crc = crc32add(crc, (mm->Subject[c]));
for (c = 0; c < strlen(mm->DateTime); c++)
crc = crc32add(crc, (mm->DateTime[c]));
if (mm->MSGID[0] == 0)
for (chunk = (struct TextChunk *) mm->TextChunks.First; chunk; chunk = chunk->Next)
if (chunk->Data)
for (c = 0; chunk->Data[c]; c++)
crc = crc32add(crc, chunk->Data[c]);
PUTULONG(*dupeinfo, crc);
c = sizeof(ulong) + 1;
if (mm->MSGID[0] == 0) {
memcpy(*dupeinfo + c, mm->DateTime, strlen(mm->DateTime));
c += strlen(mm->DateTime)+1;
} else {
memcpy(*dupeinfo + c, mm->MSGID, strlen(mm->MSGID));
c += strlen(mm->MSGID)+1;
}
memcpy(*dupeinfo + c, mm->Area, strlen(mm->Area));
return TRUE;
}
void AddDupeBuf(uchar * dat, ulong len)
{
ulong size;
dupechanged = TRUE;
while (dupe_emptyend - dupe_nextpos < len + sizeof(ulong)) {
if (dupe_nextpos + len + sizeof(ulong) + sizeof(ulong) >= config.cfg_DupeSize) {
dupe_lastinbuf = dupe_nextpos;
dupe_firstentry = 0;
dupe_emptyend = 0;
dupe_nextpos = 0;
} else if (dupe_firstentry >= dupe_lastinbuf) {
dupe_emptyend = config.cfg_DupeSize;
if (dupe_emptyend - dupe_nextpos < len + sizeof(ulong)) {
dupe_firstentry = 0;
dupe_emptyend = 0;
dupe_nextpos = 0;
dupe_lastinbuf += len;
}
} else {
size = GETULONG(dupebuf + dupe_firstentry);
dupe_firstentry += size;
dupe_emptyend += size;
}
}
dupe_lastentry = dupe_nextpos;
PUTULONG(dupebuf + dupe_nextpos, len + sizeof(ulong));
dupe_nextpos += sizeof(ulong);
memcpy(dupebuf + dupe_nextpos, dat, len);
dupe_nextpos += len;
}
int dupecomp(uchar * d1, uchar * d2, ulong len)
{
ulong c;
for (c = 0; c < len; c++)
if (d1[c] != d2[c])
return (1);
return (0);
}
bool CheckDupe(struct MemMessage * mm)
{
ulong pos;
ulong size;
uchar* dupeinfo;
ulong dupelen;
if(!MakeDupeInfo(&dupeinfo, &dupelen, mm))
/* FIXME: if memory allocation failed, treat message as non-dupe */
return FALSE;
pos = dupe_firstentry;
while (1) {
size = GETULONG(dupebuf + pos);
if (size - sizeof(ulong) == dupelen)
if (dupecomp(dupebuf + pos + sizeof(ulong), dupeinfo, dupelen) == 0) {
free(dupeinfo);
return (TRUE);
}
if (pos == dupe_lastentry)
break;
pos += size;
if (pos >= dupe_lastinbuf && dupe_lastinbuf != 0)
pos = 0;
}
AddDupeBuf(dupeinfo, dupelen);
dupechanged = TRUE;
free(dupeinfo);
return (FALSE);
}
bool WriteDupes(uchar * file)
{
FILE *fh;
ulong size;
ulong pos;
if (!dupechanged)
return (TRUE);
if (!(fh = fopen(file, "wb"))) {
LogWrite(1, SYSTEMERR, "Couldn't save dupe table to %s", file);
LogWrite(1, SYSTEMERR, "Error: %s", strerror(errno));
return (FALSE);
}
fwrite(DUPE_IDENTIFIER, 4, sizeof(uchar), fh);
pos = dupe_firstentry;
while (1) {
size = GETULONG(dupebuf + pos);
fwrite(dupebuf + pos, size, sizeof(uchar), fh);
if (pos == dupe_lastentry)
break;
pos += size;
if (pos >= dupe_lastinbuf && dupe_lastinbuf != 0)
pos = 0;
}
fclose(fh);
dupechanged = FALSE;
return (TRUE);
}
bool ReadDupes(uchar *file)
{
FILE *fh;
uchar *buf;
ulong size;
uchar id[5];
if (!(fh = fopen(file, "rb")))
return (TRUE);
fread(id, 4, sizeof(uchar), fh);
id[4] = 0;
if (strncmp(id, DUPE_IDENTIFIER, 4) != 0) {
LogWrite(1, SYSTEMERR, "Unknown format of dupe file %s, exiting...", file);
fclose(fh);
return FALSE;
}
while (fread(&size, 1, sizeof(ulong), fh) == sizeof(ulong)) {
if ((buf=malloc(size - sizeof(ulong))) == NULL) {
fclose(fh);
LogWrite(1, SYSTEMERR, "Error allocating %ld bytes while reading %s", size - sizeof(ulong), file);
return FALSE;
}
fread(buf, size - sizeof(ulong), sizeof(uchar), fh);
AddDupeBuf(buf, size - sizeof(ulong));
free(buf);
}
fclose(fh);
dupechanged = FALSE;
return TRUE;
}
bool AllocDupebuf(void)
{
if (!(dupebuf = malloc(config.cfg_DupeSize)))
return FALSE;
dupe_firstentry = 0;
dupe_lastentry = 0;
dupe_nextpos = 0;
dupe_emptyend = config.cfg_DupeSize;
dupe_lastinbuf = 0;
dupechanged = FALSE;
return (TRUE);
}
void FreeDupebuf(void)
{
free(dupebuf);
}
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